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Analog Devices Inc. LTC2305CDE#PBF
- Part No.:
- LTC2305CDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2305CDE#PBF.pdf
- Description:
- IC ADC 12BIT SAR 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:170
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Product details
Overview
LTC2305CDE#PBF from Analog Devices (formerly Linear Technology) is a 2-channel, 12-bit successive approximation ADC with I²C-compatible serial interface, internal 2.5V reference and 4.096V buffered reference output (REFCOMP), operating from a single 5V supply at 14ksps throughput and delivering 73.5dB SNR. It supports software-selectable unipolar (0V–4.096V) or bipolar (±2.048V) input ranges and targets precision sensor digitization in space-constrained industrial systems.
For engineers reviewing the LTC2305CDE#PBF datasheet, LTC2305CDE#PBF pinout, LTC2305CDE#PBF application, or LTC2305CDE#PBF equivalent, key selection considerations include its dual-channel differential/single-ended MUX architecture, guaranteed no missing codes over –40°C to 125°C (MSOP), 1.3μs conversion time, and I²C address configurability via AD0/AD1 pins for multi-device bus operation.
Technical Context
The LTC2305CDE#PBF implements a fully differential sample-and-hold circuit with internal SAR architecture, enabling common-mode noise rejection during acquisition. Its analog input multiplexer supports dynamic reconfiguration between CH0/CH1 as differential pairs or single-ended inputs relative to GND, controlled by S/D and O/S bits in the 6-bit DIN command word.
It uses an internal conversion clock and integrates a 2.5V reference with ±25ppm/°C tempco and 4.096V REFCOMP buffer (10μF + 0.1μF bypass required). The I²C interface operates at up to 400kHz with Schmitt-triggered SCL/SDA, supports 9 device addresses plus global sync, and requires external pull-ups on SDA due to open-drain output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes - ensures monotonic transfer function for control-loop stability. |
| Throughput Rate | 14ksps - enables real-time sampling of motor current or accelerometer signals up to ~7kHz Nyquist bandwidth. |
| SNR | 73.5dB at 1kHz - supports >11.9 effective bits for high-fidelity sensor signal capture. |
| Integral Nonlinearity | ±1 LSB max - limits absolute measurement error to ±0.025% of full-scale range (4.096V). |
| Supply Current | 300μA at 1ksps, 7μA in sleep mode - extends battery life in portable instrumentation. |
| Input Range | Software-selectable 0V–4.096V (unipolar) or ±2.048V (bipolar) - accommodates both ground-referenced and AC-coupled transducer outputs. |
| Reference | Internal 2.5V VREF (±25ppm/°C) + 4.096V REFCOMP buffer - eliminates external reference IC and reduces BOM count. |
Pinout & Package
Package: 12-lead (4mm × 3mm) plastic DFN with exposed pad (Pin 13 = GND), rated for 0°C to 70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 9) | Ground reference | Must connect to solid ground plane; all three pins carry return current for analog/digital sections. |
| SDA (Pin 2) | I²C bidirectional data line | Open-drain output during read (requires external pull-up); high-impedance input during write configuration. |
| SCL (Pin 3) | I²C clock input | Accepts external master clock only; data latched on rising edge, shifted out on falling edge. |
| CH0 (Pin 5) | Channel 0 analog input | Configurable as IN+ or IN− in differential mode, or single-ended input referenced to GND. |
| CH1 (Pin 6) | Channel 1 analog input | Paired with CH0 for differential measurement or used independently for second single-ended channel. |
| VREF (Pin 7) | 2.5V internal reference output | Bypass with ≥2.2μF ceramic capacitor; can be overdriven by external 2.5V source to disable internal ref. |
| REFCOMP (Pin 8) | 4.096V reference buffer output | Bypass with 10μF + 0.1μF ceramics; disabled when VREF is grounded - allows external 4.096V override. |
| VDD (Pin 10) | 5V analog supply | 4.75V–5.25V range; bypass with 10μF + 0.1μF ceramics to suppress supply noise coupling into conversion. |
| AD1 / AD0 (Pins 11, 12) | I²C address select bits | Three-state (LOW/HIGH/floating) inputs set device address; enable up to 9 unique addresses on same bus. |
| GND (Pin 13) | Exposed thermal pad | Must be soldered to PCB ground plane for thermal dissipation (θJA = 43°C/W) and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel analog MUX | CH0/CH1 configurable as independent single-ended inputs or as a differential pair - enables simultaneous voltage/current sensing without external multiplexing. |
| Internal reference system | Integrated 2.5V VREF and 4.096V REFCOMP eliminate need for external precision references - reduces board area and calibration complexity. |
| I²C address flexibility | AD0/AD1 pins support 9 discrete addresses plus global sync - simplifies multi-ADC system design on shared bus without address conflicts. |
| Low-power nap/sleep modes | 300μA active (1ksps), 7μA sleep - extends runtime in battery-powered data loggers while maintaining fast wake-up (<200ms REFCOMP settle). |
| Guaranteed operation range | Specified from 0°C to 70°C (C-grade) with full performance - suitable for commercial and light industrial environments without derating. |
Applications
| Industrial Process Control | Motor Control Feedback |
|---|---|
|
Use Scenario: Monitoring multiple analog process variables (e.g., pressure, temperature, flow) in PLC I/O modules. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes two 4–20mA loop receivers or RTD bridge outputs with synchronized sampling. Use Value: Eliminates external multiplexer and reference ICs, reducing component count and improving channel-to-channel matching (±0.1 LSB full-scale error match). |
Use Scenario: Capturing phase currents and DC bus voltage in BLDC motor drives for field-oriented control. IC Role / Device Role / Timing Role: Simultaneous sampling of current-sense amplifier outputs and shunt voltage with <240ns acquisition time. Use Value: Enables precise current vector reconstruction at 14ksps, supporting torque ripple reduction and efficient PWM commutation. |
| Accelerometer Measurements | Power Supply Monitoring |
|
Use Scenario: Digitizing outputs from triaxial MEMS accelerometers in structural health monitoring nodes. IC Role / Device Role / Timing Role: Configured in differential mode to reject common-mode vibration noise on PCB traces. Use Value: 73.5dB SNR and 700kHz full linear bandwidth preserve signal integrity for FFT-based fault detection algorithms. |
Use Scenario: Real-time monitoring of rail voltages (e.g., 3.3V, 5V, 12V) and current sense in telecom power shelves. IC Role / Device Role / Timing Role: Unipolar mode measures 0–4.096V scaled inputs; I²C interface enables polling by system management controller. Use Value: Internal 4.096V reference provides stable scaling factor across temperature, eliminating gain drift in voltage margining. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-channel, I²C-compatible, 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-pin SOIC, SPI interface only, no internal reference - requires external 2.5V ref and level-shifting for 5V systems. | Lower integration increases BOM cost and layout area; lacks I²C bus compatibility for multi-node systems. | Choose when SPI-native microcontrollers dominate the design and board space is not constrained. |
| MCP3221-AI/P | Single-channel, 12-bit, I²C, 2.7–5.5V supply - no REFCOMP buffer, unipolar-only input (0–VDD), ±2 LSB INL. | Cannot replace dual-channel functionality without adding second device; limited to single-ended measurements. | Consider only for cost-sensitive, single-sensor applications where channel count and bipolar range are unnecessary. |
Compared with ADS7822U and MCP3221-AI/P, the LTC2305CDE#PBF delivers higher integration (dual channels + internal reference + I²C address flexibility), superior DC accuracy (±1 LSB INL vs ±2 LSB), and direct 5V compatibility - making it optimal for compact, multi-sensor industrial nodes requiring minimal external components.
Availability
LTC2305CDE#PBF is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, and power supply monitoring requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2305CDE#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2305CDE#PBF belongs to the LTC230x family of low-power, I²C-compatible SAR ADCs designed for precision sensor interfacing in space- and power-constrained industrial and portable equipment.
FAQ
What is the maximum sampling rate of the LTC2305CDE#PBF?
The LTC2305CDE#PBF achieves a maximum throughput rate of 14ksps under standard conditions (VDD = 5V, fSCL ≤ 400kHz). This corresponds to a minimum conversion time of 1.3μs and supports Nyquist bandwidths up to 7kHz. At lower rates (e.g., 1ksps), supply current drops to 300μA, optimizing power for battery-operated systems using the LTC2305CDE#PBF.
Does the LTC2305CDE#PBF support differential input measurements?
Yes, the LTC2305CDE#PBF supports true differential input operation between CH0 and CH1 via software configuration using the S/D and O/S bits in the 6-bit DIN command word. In differential mode, it accepts ±2.048V bipolar input ranges with 73.5dB SNR and 700kHz full linear bandwidth - critical for rejecting common-mode noise in noisy industrial environments using the LTC2305CDE#PBF.
How is the I²C address configured on the LTC2305CDE#PBF?
The LTC2305CDE#PBF uses AD0 (Pin 12) and AD1 (Pin 11) as three-state address select pins (LOW/HIGH/floating), enabling 9 unique I²C addresses (0x48–0x4E) plus one global address (0x4F) for synchronized conversions. This eliminates address conflicts in multi-ADC systems and avoids external address jumpers - a key advantage over fixed-address alternatives like the LTC2305CDE#PBF's competitors.
Can the internal reference of the LTC2305CDE#PBF be disabled or overridden?
Yes, the LTC2305CDE#PBF allows full reference flexibility: grounding VREF (Pin 7) disables the internal 2.5V reference and permits overdriving REFCOMP (Pin 8) with an external 4.096V source; alternatively, VREF can be overdriven directly with an external 2.5V reference. This supports calibration-critical applications where traceable external references are mandated, extending the utility of the LTC2305CDE#PBF beyond its default configuration.
What package type and thermal characteristics does the LTC2305CDE#PBF use?
The LTC2305CDE#PBF is supplied in a 12-lead (4mm × 3mm) plastic DFN package with exposed thermal pad (Pin 13 = GND), achieving θJA = 43°C/W. The exposed pad must be soldered to the PCB ground plane for effective heat dissipation and EMI suppression. This compact footprint supports high-density layouts in portable instrumentation where the LTC2305CDE#PBF replaces larger MSOP variants without sacrificing thermal performance.
LTC2305CDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 14k
- Number of Inputs:
- 2
- Input Type:
- Differential, Single Ended
- Data Interface:
- I2C
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Selectable Address
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 12-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2305CDE#PBF FAQ
1.How can I place an order for LTC2305CDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2305CDE#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC2305CDE#PBF reliable?
The price and inventory of LTC2305CDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2305CDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC2305CDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2305CDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2305CDE#PBF?
LTC2305CDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2305CDE#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC2305CDE#PBF?
For technical support, including LTC2305CDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2305CDE#PBF requirements.
6.How does Aetrix verify that LTC2305CDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2305CDE#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC2305CDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC2305CDE#PBF?
All LTC2305CDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2305CDE#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC2305CDE#PBF part is unused and in its original packaging.
Return procedure for LTC2305CDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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